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I want to optimize the geometry  of Dithiobis succinimidyl propionate (DTSP) with B3LYP.
I used Gaussianview to construct DTSP without any restriction. However, the C-O bond broke and two head groups(C4H4NO3-, ) came together during optimization. The structure is totally changed. At last, the calculation died at link 9999. What should I do if I want to avoid this?
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The initial structure is not reasonable or it is completely wrong,
5Â¥2010-07-29 13:33:28
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There are some mistakes for many people  that they constructed initial molecule geometry wihtout  checking the rationality which results the wrong phenomena as LZ
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